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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/coregui/Views/CommonWidgets/ItemSelectorWidget.cpp
//! @brief Implements class ItemSelectorWidget
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "GUI/coregui/Views/CommonWidgets/ItemSelectorWidget.h"
#include "GUI/coregui/Models/SessionDecorationModel.h"
#include "GUI/coregui/Models/SessionModel.h"
#include "GUI/coregui/mainwindow/mainwindow_constants.h"
#include <QListView>
#include <QVBoxLayout>
ItemSelectorWidget::ItemSelectorWidget(QWidget* parent)
: QWidget(parent), m_listView(new QListView), m_model(nullptr)
{
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
QVBoxLayout* layout = new QVBoxLayout;
layout->setMargin(0);
layout->addWidget(m_listView);
setLayout(layout);
m_listView->setContextMenuPolicy(Qt::CustomContextMenu);
m_listView->setAttribute(Qt::WA_MacShowFocusRect, false);
connect(m_listView, &QListView::customContextMenuRequested, this,
&ItemSelectorWidget::onCustomContextMenuRequested);
}
ItemSelectorWidget::~ItemSelectorWidget() = default;
QSize ItemSelectorWidget::sizeHint() const
{
return QSize(Constants::ITEM_SELECTOR_WIDGET_WIDTH, Constants::ITEM_SELECTOR_WIDGET_HEIGHT);
}
QSize ItemSelectorWidget::minimumSizeHint() const
{
return QSize(25, 25);
}
void ItemSelectorWidget::setModel(SessionModel* model)
{
if (model == m_model)
return;
disconnectModel();
m_model = model;
connectModel();
}
void ItemSelectorWidget::setItemDelegate(QAbstractItemDelegate* delegate)
{
m_listView->setItemDelegate(delegate);
}
QItemSelectionModel* ItemSelectorWidget::selectionModel()
{
return m_listView->selectionModel();
}
QListView* ItemSelectorWidget::listView()
{
return m_listView;
}
void ItemSelectorWidget::select(const QModelIndex& index,
QItemSelectionModel::SelectionFlags command)
{
selectionModel()->select(index, command);
}
//! select last item if no selection exists
void ItemSelectorWidget::updateSelection()
{
if (!selectionModel()->hasSelection())
selectLast();
}
void ItemSelectorWidget::selectLast()
{
QModelIndex itemIndex = m_model->index(m_model->rowCount(QModelIndex()) - 1, 0, QModelIndex());
selectionModel()->select(itemIndex, QItemSelectionModel::ClearAndSelect);
}
void ItemSelectorWidget::onSelectionChanged(const QItemSelection& selected, const QItemSelection&)
{
QModelIndexList indexes = selected.indexes();
SessionItem* selectedItem(0);
if (!indexes.empty())
selectedItem = m_model->itemForIndex(indexes.back());
emit selectionChanged(selectedItem);
}
void ItemSelectorWidget::onCustomContextMenuRequested(const QPoint& point)
{
emit contextMenuRequest(m_listView->mapToGlobal(point), m_listView->indexAt(point));
}
void ItemSelectorWidget::connectModel()
{
if (!m_model)
return;
m_decorationModel = std::make_unique<SessionDecorationModel>(nullptr, m_model);
m_listView->setModel(m_decorationModel.get());
connect(m_listView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
&ItemSelectorWidget::onSelectionChanged, Qt::UniqueConnection);
}
void ItemSelectorWidget::disconnectModel()
{
m_listView->setModel(nullptr);
m_model = nullptr;
}
//! provide default selection when widget is shown
void ItemSelectorWidget::showEvent(QShowEvent*)
{
if (!m_model || !selectionModel())
return;
if (selectionModel()->selectedIndexes().isEmpty() && m_model->rowCount(QModelIndex()) != 0)
selectionModel()->select(m_model->index(0, 0, QModelIndex()), QItemSelectionModel::Select);
}
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